Stevens ([STEVENS] page 25) gives a general idea of how many lines of code (LOC) it takes to implement the various protocols, both the kernel code, and the C application programming interface.
| Protocol | #LOC |
| UDP | 800 |
| TCP | 4500 |
| T/TCP | 5700 |
At an estimation it takes an extra 1200 lines of code to fully implement T/TCP for Linux.